Process of making edge-corrugated sheet-metal articles



v A. s. BARROWS.

PROCESS OF MAKING EDGE CORRUGATED SHEET METAL ARTICLES.

1,341,967. Flgj APPLICATION FILED MAR. 28, 1919- Patented June 1, 1920.

IN VEN TOR. flllalz 5 Barramfi ATTORN scribed.

ALLAN S. BARROWS, OF CHICAGO, ILLINOIS.

PROCESS OF MAKING EDGE-CORRUGATED SHEET-METAL ARTICLES.

Specification of Letters Patent.

Patented June 1, 1920.

Application filed March 28, 1919. Serial No. 285,850.

To all whom it may concern: I

Be it known that I, ALLAN S. BARRows, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois,- have invented a certain new and useful Process of Making Edge-Corrugated Sheet-Metal Articles, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this speci fication.

This invention relates to process of making edge corrugated sheet metal articles.

It is frequently desirable to provide sheet metal articles with corrugations extending transversely to the edges of the article and forming an actual part of the edges and leaving the edge so that all portions thereof remain in a single plane instead of with a scalloped or uneven or irregular formation. ()ne use'of such an article of manufacture is disclosed in my co-pending application filed March 28, 1919, for improvement in sheet metal doors, Serial No. 285,851.

The object of this invention is to provide a process or series of steps of treating sheet metal which will produce an article having a corrugated edge with all edge portions in the same plane and which will avoid tearingof the edge of the metal and eliminate all unevenness or irregularities in the extreme edge.

In the drawing forming a part of thisspecifioation, Figure l is a diagrammatic View of a plain sheet of metal such as used in carrying out my process, parts being broken away in order to better accommodate the figure on the sheet; Fig. 2 illustrates,

upon an enlarged scale, the sheet after it has been subjected to the corrugating step of the process. This figure also indicates the cutting or parting line hereinafter de- Fig. 3 is a detail perspective of a finished article made by my process, the two dotted positions of Fig. 3 indicating how the sheet may be otherwise bent or formed, but this has no particular bearing on the process described and claimed. Figs. A and 5 are views corresponding respectively to Figs. 2 and 3, illustrating an additional step which maybe carried out in conjunction with my process, that is, the provision of a longitudinal corrugation where the same is desired.

Referring first. to the construction illustrated in Figs. 1, 2 and 3, A denotes a sheet of metal of elongated rectangular formation. The same is of greater width than the desired article and in the particular instance shown is twice as wide as the desired finished article so that two of the articles may be made simultaneously to thereby minimize cost and preventwaste of metal. The plain sheet is first subjected to either stamping or roll dies so as to form within the sheet a series of transversely extending, properly similar corrugations applied to a free edge of the sheet and it is also obvious that there will be no unusual tendency to distort or warp the sheet in the formation. of the comparatively simple and shallow corrugations B. After the corrugations B have been formed, the sheetnow referenced A is then split or slit along the median line C, this being preferably donein reciprocating dies conformed of course to the corrugated sheet A. During the slitting or parting opera.- tion, the sheet A may be bent along the dotted lines indicated at 10-10 so as to form a right angle flange as indicated at 11 in Fig. 3. 'I Vith the process hereinbefore described, it is evident that all. edge portions of the sheet having the corrugations therein will be maintained in a single plane thus avoiding any scalloped effect or irregularities without danger of tearing of the metal.

The process also permits the simultaneous manufacture of two of such articles, thus decreasing cost of manufacture and avoiding waste of any metal. As will be evident to those skilled in the art, where it is not desired to make two similar parts simultaneously, a salvage may be utilized within which would be formed the unrequired portions of the corrugations B prior to the slitting'or die-cutting operation.

In the process illustrated by Figs. 4 and 5, the steps are the same except that either before, simultaneously with, or subsequent to the formation of the transverse corrugations B, I may form longitudinally extend- Lil ing corrugations D-D. In such case I would, ofcourse, require a wider sheet than for the/process illustrated in Figs. 1, 2 and 3. After the formation of the corrugations B and D, the sheet A willbe slit or parted 7 along the line Cin the manner heretofore described, thus leaving the finished article as shown in Fig. with edge corrugations '12 sponding to the finished edge, and then slitand through 1 the corrugations.

c pended hereto.

Vmanner of carrying'out the invention, the

same is merely illustrative and I contemplate all changes and modifications that come within the scope of the claims ap- I claim: 1. The herein described process of making an article from sheet inaterial'having its margin provided with transverse corrugations therein which includes; providing a sheet of greater width than the required finished article, corrugating the sheet in the line where the corrugated edge of the finished article is to come, and then slitting the sheet through the corrugations thus it made and\on the line of the desired finished edge.

2. an, article from sheet material having its margin provided with corrugations therein including; providing a sheet of the material c having a portion thereof extended beyond where the desired finished edge isfto be; corrugating the sheet across the line correting the sheet along said line 3. The herein described process of 'making an article from sheet material having its The herein'described process of making margin provided with corrugations therein arranged at substantially right angles to an edge of the marginal portion including;

roviding a sheet of material of greater width than the width of the required finished article; providing the sheet with a series of corrugations arranged transversely of the required finished edge, the corrugations extending to each side of the line of the finished edge; then slitting the sheet along said line of its edge, the line of slitting passing transversely through the corrugations.

4. The herein described process of making an article of sheet material having one edge thereof provided with transverse corrugations and with a longitudinally extending corrugation therein including; vproviding a sheet of greater Width than the required finished article; forming a longitudinally extending corrugation within the sheet; forming a series of spaced corrugationsextending transversely to and crossing the line of vthe corrugated edge of the finished article; and slitting the sheet after said transverse corrugations have xbeen formed along the line of the edge of the finished article.

5. The herein described process of making sheet material articles having corrugated edges including; taking a sheet of metal *of double the width of the required articles; corrugating said sheet with a series of trans-c verse corrugations extending equally on opposite sides of a central line extending lengthwise of the sheet, and then slitting the sheet along said central longitudinally extending line and leaving halves of the cor-'1 rugations in the edges of thetwo articles thus formed; 7 I

In witness that I claim the foregoing I have hereunto subscribed my name this 13th day of March, 1919. Q

7 j ALLAN S. BARROWS.

W'itnessesz. V

JOSEPH HARRIS, META SCHMIDT. 

